Remove dead code

src/ImageSharp/Processing/Processors/Convolution/MedianBlurProcessor{TPixel}.cs

@@ -30,9 +30,10 @@ namespace SixLabors.ImageSharp.Processing.Processors.Convolution
 
             var interest = Rectangle.Intersect(this.SourceRectangle, source.Bounds());
 
-            // We use a rectangle with width set to 2 * kernelSize^2 + width, to allocate a buffer big enough
-            // for kernel source and target bulk pixel conversion.
-            var operationBounds = new Rectangle(interest.X, interest.Y, (2 * kernelSize * kernelSize) + interest.Width + (kernelSize * interest.Width), interest.Height);
+            // We use a rectangle with width set wider, to allocate a buffer big enough
+            // for kernel source, channel buffers, source rows and target bulk pixel conversion.
+            int operationWidth = (2 * kernelSize * kernelSize) + interest.Width + (kernelSize * interest.Width);
+            var operationBounds = new Rectangle(interest.X, interest.Y, operationWidth, interest.Height);
 
             using var map = new KernelSamplingMap(this.Configuration.MemoryAllocator);
             map.BuildSamplingOffsetMap(kernelSize, kernelSize, interest, this.definition.BorderWrapModeX, this.definition.BorderWrapModeY);

src/ImageSharp/Processing/Processors/Convolution/MedianRowOperation{TPixel}.cs

@@ -85,7 +85,6 @@ namespace SixLabors.ImageSharp.Processing.Processors.Convolution
                     ref Vector4 target = ref Unsafe.Add(ref targetBase, x);
                     for (int kY = 0; kY < state.Kernel.Rows; kY++)
                     {
-                        int currentYIndex = Unsafe.Add(ref sampleRowBase, kY);
                         Span<Vector4> sourceRow = sourceVectorBuffer.Slice(kY * boundsWidth);
                         ref Vector4 sourceRowBase = ref MemoryMarshal.GetReference(sourceRow);
                         for (int kX = 0; kX < state.Kernel.Columns; kX++)
@@ -98,7 +97,6 @@ namespace SixLabors.ImageSharp.Processing.Processors.Convolution
                     }
 
                     target = this.FindMedian3(state.Kernel.Span, xChannel, yChannel, zChannel, kernelCount);
-                    state.Kernel.Clear();
                 }
             }
             else
@@ -111,7 +109,6 @@ namespace SixLabors.ImageSharp.Processing.Processors.Convolution
                     ref Vector4 target = ref Unsafe.Add(ref targetBase, x);
                     for (int kY = 0; kY < state.Kernel.Rows; kY++)
                     {
-                        int currentYIndex = Unsafe.Add(ref sampleRowBase, kY);
                         Span<Vector4> sourceRow = sourceVectorBuffer.Slice(kY * boundsWidth);
                         ref Vector4 sourceRowBase = ref MemoryMarshal.GetReference(sourceRow);
                         for (int kX = 0; kX < state.Kernel.Columns; kX++)
@@ -124,7 +121,6 @@ namespace SixLabors.ImageSharp.Processing.Processors.Convolution
                     }
 
                     target = this.FindMedian4(state.Kernel.Span, xChannel, yChannel, zChannel, wChannel, kernelCount);
-                    state.Kernel.Clear();
                 }
             }